(:*******************************************************:)
(: Test: K2-SeqExprCast-57                               :)
(: Written by: Frans Englich                             :)
(: Date: 2007-11-22T11:31:21+01:00                       :)
(: Purpose: The minus sign is prohibited in positiveInteger. :)
(:*******************************************************:)
xs:positiveInteger("-1")